I really enjoyed the problem set for round 2. I still haven't figured out the solution for problem C though, Don't Break the Nile. Can anyone give me the short version while we wait for the analysis? I can see how it could be modeled as a maximum flow problem, but it would be way too large to be solvable. I assume from the large constraints it should be possible to process row-by-row up the river, but any method I can think of breaks down on maze-like rivers with dead ends, etc. where it seems like you would need to backtrack.

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